I m not using the CU layer tail lights. I was thinking of going to them, however, if there is a problem, I want to fix that first. I have not checked the tail light ground. If I put the incandescent bulbs back in, they are as bright as the LEDs, which seem to be normal bright for 6 volt tail lights. I checked the battery ground. I had really cleaned it up in April Now 4 months later it has about an inch of green corrosion on the end clamped to the battery. I will replace it. I also took the second 6 volt to 12 volt converter off trying to follow "Keep it simple". As far as the horn in concerned, I am going to replace the horn button and check the contact ring. The last time I was in there I had to put spacers on the contact ring in order for the button to make contact.